Laes engebeetsef



(No Model.)

L. ENGEBRETSEN.

SLIDE VALVE. No. 374,463. Patented Dec. 6, 1887.

WITNESSES: IIQVENIdR N. PETERS. mmwuuw m hm Waihingicn, 0.0.

UNITED STATES PATENT OFFICE.

LABS ENGEBRETSEN, OF OHRISTIANIA, NORiVAY.

SLIDE-VALVE.

$PECIP ICATION forming part of Letters Patent No. 374,463, datedDecember 6, 1887,

Application filed January 11,1887. Serial No.22-1.019. (No model.)Patented in Norway Novembrr 2, 1385, No.2, and in Sweden February 19,1886, No. 375.

To aZZ whom it may concern.-

Be it known that I, LARs ENGEBRETSEN, of Ohristiania, Norway, haveinvented a new and useful Improvement in Slide-Valves for Steam-Engines,which improvement is fully set forth in the following specification andaccompanying drawings, in which Figure 1 is a side elevation of myimproved slide-valve; Fig. 2, a plan view of the same in section throughthe central line of the guides oftheslide-valve spindles; Fig. 3, atransverse vertical central section through the slide-valve spindles atX, and Fig.4 an end elevation of the slide-valve in section.

The object of this invention is to provide a slide-valve of suchconstruction that an even speed of the engine is obtained, and to thatend the regulation of the steam is provided by expansion slide-valves,which are placed on the back of the distributing slide-valve, and aredirectly combined with the governor, so that as the said governor issunk or raised the expansion-valves enlarge or contract, and in thismanner cut off the steam fora longer or shorter portion of the strokeand supply just sufficient quantity of steam into the cylinder as isrequired for performing its work evenly and continuously, as will be nowfully set forth.

In the accompanying drawings, a represents a horizontal shaft connectingwith a governor. (Not shown.) This shaft has a right-angled lever, b,which in turn is connected with a shaft, a, by means of aconnecting-rod, c, attached to a rightangled lever, d, on the saidshaft. The lever d is provided at its inner end with a sleeve, 6, havingtherein a square opening to embrace a corresponding square portion ofthe shaft a. Thus the governor is connected with the shaft to, and thisin turn is connected with the shaft a. This latter shaft is journaled soas to have somewhat of a rotary motion. At each end of the steamchestare provided inlet-ports s 8. On the inner side of the steamchest areplaced longitudinal ways or grooves t, and into the said ways are snuglyfitted two sliding plates, u, so disposed as to fit closely against theouter face of the slide-valve w. A stud, 0, projects rigidly from thewalls of the steamchest toward the shaft a. This stud carries a stoutcollar provided on either side with wings and on one portion with asegment of toothed gearing f. Engaging with this is a segment of toothedgearing, g, securely fixed on the said stem. On the wings are allixedpins h, which, with the rods 13, are connected with collars k, whichslide on the shaft, but are combined with the expansion slidevalves bythe ribs Z. Thus the expansion sleeves will thereby follow the motion ofthe wings 71, to make the distance between the expansionvalves longer orshorter as the governor sinks or lifts, and in this manner cut off thesteam earlier and cause easy working of the engine, however variable thework to be performed.

To keep the expansion-valves in position, a proportion of thedistributing slide-valve or sleeve m is loose on the spindle of theshaft a, so that the latter can be turned independent of the sleeve,which, however, must follow the longitudinal motion of the shaft, butsecured in position by the segment toothed wheel g on one end, and by acollar, 92, which is fixed to the spindle on the other. The. pivot 0,which is forged integral with the sleeve m, serves as the shaft for thepinionf, and is adjusted by the wings h, and the rods i, connected withthe expansion slide-valves, will necessarily always be in a rightposition.

When the engine is working against a strong resistance, the sleeves arewithdrawn and the ports'entirely open. \Vhen the resistance is removed,the connecting-rod of the governor rises, and the arm (1 causes therevolution of the segment g. This engaging with the collar 0 partiallyrotates it and causes it, by means of the expansion carrying theconnecting-rod, to shove the plates at u partially over the ports 3 s,and thus automatically reduces the admission of the steam.

It is evident that this mechanism is serviceable both for land andmarine engines, though occasional modifications may be necessary inorder to make it adaptable.

Having described my invention, what I claim 1s 1. In a slide-valve, thepair of sliding plates fitted within longitudinal ways or grooves inclose connection with the outer face of the slide-valve andconnecting-rods engaging with- 10c troduced into the cylinder, as andfor the purpose substantially as herein set forth.

2. In a slide-valve, the pair ofsliding plates fitted with longitudinalways or grooves in close connection with the outer face of theslide-valve and connecting-rods engaging with the wings of a collarhaving a segment or toothed gearing engaging with a correspondingsegment of a collar on the rotating shaft, with the shaft having thereonthe collar having the segmental gearing, the opposite end having asquare portion to receive a sleeve at the inner end of the lever, and aconnectingrod attached thereto engaging with the shaft in connectionwith the governor, substantially as herein set forth.

3. The combination of the shaft a, in communication with the governor,and the shaft a, connected by means of a rod, 0, the said shaft to sodisposed with the square portion inserted within the collar of theconnectingrod lever as to be rotated and form an extension-rod with thecollars 9, provided .with a segment of toothed gearing to engage with acorresponding gearing on a vertical stem of another collar on the shaft,so disposed as to operate the slide-valves u by means of connecting-rodswhen the shaft a is rotated, and thus form out offs for the inlet-ports,substantially as herein set forth.

4. The combination of the rotating eXpansion-shaft a, the parallelgovern or-shaft a, connectingrod c, the sleeve 9, having thereon thesegmental gearing to engage with corresponding segmental gearing f onthe stem of a sec- 0nd collar on the expansion-shaft a, the valves 20,the connecting-rods 71, the wings h, and 111- let-ports s, the wholearranged as and for the purpose substantially as herein set forth anddescribed.

In testimony that I claim the foregoing I have hereunto set my hand,this 3d day of August, 1886, in the presence of witnesses.

LABS ENGEBRETSEN.

WVitnesses:

OLAF SOIAAEN, Ovn A. OLSEN.

